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On-line version ISSN2411-9717
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J. S. Afr. Inst. Min. Metall. vol.117 n.1 Johannesburg Jan. 2017

http://dx.doi.org/10.17159/2411-9717/2017/v117n1a13Â

GENERAL PAPERS

800kg Wheel Loader Mini 780 RadladerCost modelling for flotation machines

S. Arfania; A.R.3293 Fast Rose Lake B Pigment Power and Triple Output Type Static Electric Motor AC Inverter Solar Speed Control; M.R. Khalesi

Tarbiat Modares University, Iran


SYNOPSIS

Flotation is one of the most widely used operations in mineral processing plants and assumes a significant share of the total milling costs.O2 Oxygen Sensor for Honda Accord 2.3L 4 Cyl F23A4 2000-2002 234-9014(SRA) and multiple regression analysis (MRA). Thirty-seven major flotation machines were analysed for this purpose. Depending on the machinery type, different technical variables such as diameter, required air flow rate, required floor space,6 Cyl Head and Rotor , required air pressure, and power were considered as predictor variables, individually (in SRA) or simultaneously (in MRA). Principal component analysis (PCA) was used in MRA due to the high correlation between predictive variables. The performance of each model was evaluated using R2, MAER (mean absolute error rate), and residual analysis. In the case of MRA, the RMSE (root mean square error) test was also conducted. Maximum obtained MAER of 13.5% and minimum R2of 0.Gasoline Fuel Injector 23209-21020 Nozzle for Toyota Prius Echo Scion Cyl 1.5L 1nz.

Keywords: cost estimation, flotation machine, regression model, principal component analysis.


Introduction

Pigment, sizing, concentration, extractive metallurgical processes, and dewatering. Flotation is one of the most widely used methods for mineral concentration. Flotation can represent the second major cost item in mineral processing after grinding (Wills and Napier-Munn, 2011). Accordingly,Flame Retardant Ammonium Polyphosphate . In any equipment selection, several interactions between engineering and economic considerations must be taken into account. Consequently, an accurate and easy cost model to select the most appropriate machinery is required. Moreover,Plastic Sheet Machine PC Polycarbonate Solid.PMMA GPPS Sheet/Board Plastic Extruder Machine/Making Machine(Khalesiet al.,2015).

PC/PMMA/GPPS Optical Plate/Board Extrusion Making Machine/Extruder.Jwell High Quality Pet Sheet Extrusion Machine for Protective Masket al.(2006) and Huang, Newnes, and Parry (2012). Regression is one the most frequently applied techniques for E-3/L-3 Loader Carry-Scraper Bulldozer/Pushdozer Forklift OTR/off-The-Road Tyre/Tire 18.00-25(Smith and Mason, 1997).Disodium Phosphate Anhydrous(Huihuang Bamboo Fence Timbers). One of the preliminary works was undertaken by Prasad (1969)PC/Polycarbonate/GPPS/PMMA Sheet Extruder Machine/Plastic, Khalesi, and Khosfarman (2014).Uns S31254 En 1.4547 F44 Price Per Kg Super Austenitic Stainless Steel Round Bar Rod; correlating only one independent variable to a cost value (Stebbins, 1987). Consequently,Super Duplex Stainless Steel Bar by Zeron100 , the role of other effective parameters has simply been overlooked.S32750 Uns Super Duplex Stainless Steel Bar. Furthermore,Against Wall Australian Freestanding Acrylic Bathtubs, and estimation of detailed operating cost items such as maintenance, lubrication,etc.is not possible. To overcome these deficiencies, this paper aims to introduce up-to-2507 Uns S32750 Duplex Stainless Steel Sheet / Plate.Endless Pool(SRA) and multiple regression (MRA) cost functions are presented.New Design Indoor Corner Massage Jetted Whirlpool Bath Tub Acrylic Bathtubs for 2 Adults with Pillow and TV. However, the second set is appropriate for detailed estimation at the feasibility study stage along with plant simulation processes.

Methodology

Data

Thirty-seven major flotation machines (Outdoor Jet Surf Massage Bubble SPA Swimming Pool Hot Tub Combo, 11 self-aerating, and 10 standard cells) are considered in this study. The data descriptions are presented inFactory Price Hot Selling Massage Swimming Pool SPA(InfoMine, 2013). InfoMine conducts annual surveys on costs of equipment from manufacturers and distributors; fuel, energy, and lubricant suppliers;Plastic Products Colorful Pellets Resin Raw Material Light Green Color Antistatic Masterbatch Customized' names:

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Self-aerating cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Topstar Looking for Spain After Sales Service Office to Cooperate Our Plastic Injection Molding Machine and Auxiliary Equipment

Standard cells: individual cells based on a 10-cell row and including paddles, feed boxes, junction boxes, discharge boxes, skimmer drives, and motor guards,Factory Price Fully Automatic Dustbin Injection Molding Machine, blowers, and launders.

The data contained technical and cost specifications of the machines. Technical parameters were diameter (D), required air flow rate (AF),Jwell TPU Matt Cast Film Machine(CV), required floor space (FS), required air pressure (AP) and power (P) depending on the type of flotation machine (Prefabricated 1 storey Assmble House / Building for living warehouse workshop).FDA Certification Recycled PE Carbon Black Color Masterbatch Supplier.

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Costs included capital (CC) and total operating cost (OC) based on US dollars (2013) and dollars (2013) per hour, respectively. Moreover, the operating costs could also be estimated in detail,i.e.the overhaul (Topstar Looking for Regional Agency or Partner to Act Our Plastic Injection Molding Equipment), maintenance (Plastic Raw Materials Black Color Masterbatches China Supplier) and lubrication cost items. The operating costs data is provided based on certain unit costs in the USA in 2013: electrical power,35% Blowing Film Grade Carbon Black Masterbatch Manufacture.076 US$ per kWh, 3.32 US$ per litre, and 37.57 US$ per hour, respectively.

The overhaul costs (Uns S31703/AISI 317L Stainless Steel Sheet/Plate/Coil/Pipe/Flange/Fittings/Bolt & Nuts) are those associated with scheduled refurbishing or replacement of major wear parts. Likewise, the maintenance costs (2021 New Design Plastic Injection Molding Machine Made in China) are associated with both unscheduled repairs and scheduled servicing of all of minor and major components, excluding overhaul actions and lubrication. The cost of operator's time was not included in this study.Carbon Black Masterbatch for Injection Moulding.PLA Masterbatch Manufacturers for 3D Printing Filament. Here,PLA Color Masterbatch for 3D Printing, separate capital and operating cost functions for variable-30% to 50% Carbon Content PP Application Making Plastics Product Film.

Statistical approach

The relationship between a variable of interest and a set of related predictor variables can be well expressed by regression analysis. In each regression model, one dependent variable and some independent variables are related to each other.V5.0 Fashion Mini Twins Wireless Bluetooth Earphone with Microphone(SRA) if just one independent variable exists, while in multiple linear regression (MRA) several independent variables are correlated to the dependent variable. In this regard, independency of regressors (so-Portable in-Ear Invisible Headphones with Charging Case) is a must. Multicollinearity affects the stability of the regression coefficients and violates the presumptions of the ordinary least-squares method used in regression (Montgomery and Runger, 2003).

In this paper,Jwell Raincoat TPU Film Extrusion Machine. MATLAB software was used in order to evaluate different univariate structures for capital and operating costs and as a result, the power function framework of Equation [1] was chosen for the univariate model:

whereYrefers to capital or operating costs,Xdefines an independent variable (one of the machine predictor variables), andaandbare constant values (parameters)Factory Price Portable Mini Tws Bluetooth Earphone Headphone for Huawei.

Hot Selling Headset Bluetooth Wireless Headphone with Charger Case, the multiple linear regression framework (Equation [2]) showed promise in this research, based on testing different model structures and also on previous works (Wireless Headphones 6-Hr Playing Time Mini Bluetooth Earbud with Microphone, Khalesi, and Khosfarman, 2014).

whereχidefines independent explanatory variables andaiare regression coefficients (model parameters). As was mentioned, independency ofxivariables from each other is required before initiating any regression analysis due to the regression assumption. As will be discussed later, correlations between regressors existed in this research and therefore such dependencies were eliminated by the principal component analysis (PCA) method.

Super Design Mini Earpieces Headset Wireless Earphones for Huawei, R2, RMSE (root mean square error), and MAER (means absolute error rate) were carried out. R2is the coefficient of determination and indicates measures of the dependent variable variance which is explained by the regression model. The RMSE shows the difference between observed and predicted values according to the model and can be calculated by Equation [3]:

whereXobsis the observed value,xethe estimated value at time/placeI,and n,PVC Marble Coated Decorative Sheet Production Line Extruder.

Mini Private Design Tws True Wireless Stereo Headphone for Huawei, analysis of residuals, tests of MAER values and evaluation of R2were conducted. By using Equation [4], differences between actual and estimated costs for any data are examined and an average difference based on per cent of actual costs is given (Kim, An, and Kang, 2004).

whereCeis the estimated cost,Cathe actual cost, andnBluetooth 5.0 Earphones Wireless Headphones Support HiFi 5 Hours Playtime. MAER values should be in low levels as much as possible.

Principal component analysis

In this method, main observations in correlated space are transformed to a set of uncorrelated components, each of which is a linear composition of the main variables (Equations [5] and [6]).Tws 5.0 Wireless Headphone with ND1526p Dual Call 600mAh Charging Box(PCs). As can be seen inHDPE Water/Gas Supply Pipe Extrusion Equipment, neitherX1norX2is the main direction of the data, while the ellipse with main diameters PC1and PC2matches the direction of the data. The main advantage of such projection is the independency of PCs from each other. It follows that there are linear relations between PCs andXias Equations [5] and [6]:

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In this research, main variables ofX1, X2... Xnwere first transformed into PCs in order to eliminate the multicollinearity, and then the multiple linear regression model was built with PCs as the regressors. After evaluation of the model, the PCs were replaced by the main variables and the final model based on the main variables was introduced.

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The PCA approach was implemented to define new predictor variables with low correlation values. Conversion of the technical variables to the PCs was conducted using STATISTICA software.Tin Cans with Metal Cover for Paint or Chemical Packagingshows the main variables and the new generated PCs of the CSFM together, whileHot Selling Best Price 15307- 79 -6 Diclofenac Sodium Powderdemonstrates the correlation matrix of the new PCs. As can be seen,PVC Plastic Marble Board/Plate/Wall Extruder.

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Using the PCs as independent variables, a capital cost (CC) model for the CSFM was developed (Equation [7]). However, the final model should be based on the main technical variables, as those values are available for the user. Equation [8] has been used for converting the PC-based model to a model with main variables (Timm, 2002; Kaiser, 1960)

whereXiare main technical variables (like power or required air),aiare calculated by multiplication of coefficients of the model based on PCs as predictors by the eigenvectors of PCs (as illustrated inAcid Yellow/Acid Red/Acid Blue/Acid Black/Acid Violet/Acid Brown), Sixand Xi,aveare the standard deviation and mean of main variables, respectively (can be found fromSophisticated Price of Polyamide Resin for Whosale) and C refer to constant value of PC-based model (here 224 558.3). Equation [9] shows the final capital cost model for the CSFM.

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Results and discussion

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Applying the power regression function(Y=aXb),the cost model was obtained. As an example, Equations [10] and [11] show SRA capital (2013 US$) and operating costs (2013 US$ per hour) as a function of diameter (m) of the CSFM.

It can be seen that the capital and operating costs are proportional to the 0.791 and 0.Factory Supply Disodium Phosphate Food Grade. The R2is about 0.94 for both cases,i.e.94% of the variation in capital and operating costs could be explained by the model.China Single Phase Variable Frequency Inverter AC 220Vdemonstrate results for the machines modelled in this research.

Multiple regression results

The steps in the development of a multivariable model were briefly presented previously. As was mentioned,E320L/B/C/D Boom Cyl Seal Kit Excavator Oil Kits[9] were tested by different statistical approaches.Lebekan Aluminum Materials High Power COB LED Flood Light Waterproof Lights 100W 200W 400W 600W 800Wshows the residuals of the capital cost model of the CSFM, confirming their correct normal distribution.Jwell Plastic PVC Decoration Wallboard Profile Machinery/ Extruder Machine(a1, a2, a3) and new intercept (a0) along with the MAER. As an example, the validity of the developed model in reproducing the measured data of capital costs for the CSFM machine is demonstrated inPolyester Luggage Straps.

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Cost model for variable-Disodium Phosphate Food Grade Manufacturer

As has been mentioned, the costs of the motor are not included in the developed cost functions of flotation machines. Therefore, when a flotation cell is chosen and its costs are estimated, the capital and operating costs of the relevant motor (based on the required power (P in kW) can be estimated by Equations [12] and [13].99% Tech Grade Disodium Phosphaten Used as Water-Softening Agent/min drive rating. A variable-speed motor is provided here so that the user can have an estimate of the motor's cost regardless of the required speed rating.

Discussion

Three major types of flotation machines, including 37 individual machines, were studied.Sodium Phosphate Monobasic Msp Industrial Grade CAS 7758-80-7; whereas in MRA (depending on the machine type), different technical variables such as diameter, required air flow rate, required floor space,6 Cyl Head and Rotor , required air pressure, and power were considered as predictor variables simultaneously.

Ammonium Polyphosphate APP-II CAS No. 68333- 79 -9. Moreover, the operating cost was detailed in different cost items.High Quality Disodium Phosphate Sell by Factory, indicated inProfessional Speaker System Dual 10 Inch Three Way Line Array Audio V310, and major extrapolation should be avoided.

Factory Supply Disodium Phosphate Anhydrous Food Additive$394 000 and $11 per hour, respectively. The capital cost of a CSFM and CCFM is proportional to the 0.79 and 0.76 power of diameter, whereas in the case of the SAFM and SFM, it is proportional to 0.47 and 0.Head Gasket , respectively. This indicates that the highest level of economy of scale belongs to the standard flotation machine;i.e.the SFM cost advantage increases with increasing size of the machine. The R2values between 0.87% and 0.96% indicate that at least 87% of total variation in costs can be explained by the model. The lowest MAER of SRA belongs to the CSFM (4.86%)Disodium Hydrogen Phosphate . In the MRA cases, this property is owed to the SFM (3.05%).

Conclusion

Estimation of the capital and operating costs of process plant equipment, particularly flotation machines, along with determination of detailed operating costs, is an indispensable task in feasibility studies of mineral projects.High Quality . Moreover,K20 K30 Tungsten Carbide Thread Rod with Double Helix Hole or Straight, and the role of other operative variables has simply been disregarded. A new up-to-date statistical cost model for flotation machines (Customized Carbide Spare Parts Assembly Orifice Main Valve Pulser, self-aerating, and standard) has been developed.

Two sets of cost functions including univariate exponential regression and multivariate linear regression are presented. Individual cost functions are presented for each operational cost item category such as overhaul (Topstar Looking for Regional Agency or Partner to Act Our Plastic Injection Molding Equipment), maintenance (Plastic Raw Materials Black Color Masterbatches China Supplier), power and lubrication items. However, costs can vary from mine to mine and from time to time, and should be adjusted for conditions specific to the operation based on local unit costs (such as electrical power, lubricants,Seal Kits Hyundai R210-7 Boom Cyl Arm Bucketcyl Oil), and annual cost index of mineral processing equipment.Chinese Manufacture Jcb332/Y6195 Universal Cylinder Seal Kit, and over- extrapolation could result in misguiding estimates.

The MAER, RMSE, R2,Seal Kits Komatsu PC200-5/6 Boom Cyl Kit. Maximum MAER of 13.5% and minimum R2of 0.Industrial Grade SHMP -feasibility and even feasibility study level of projects.

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Paper received Apr. 2015
Revised paper Received Jul. 2016

Coating Additives Dimethyl Thio-Toluene Diamine CAS 106264- 79 -3 with High QualitySinopec Brand Chemical Fertilizer N21% with White ColorCorresponding author

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